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Primus is primarily an actor, but has also doubled and tripled as
writer and director. He worked on stage for the first decade of his
career, then made his screen bow in the Manhattan-filmed
The Brotherhood
(1968). Additional films include Boxcar Bertha (1972), Heartland (1979), Night Games (1980) and Guilty by Suspicion (1991). He also
had a continuing role on the CBSTV seriesCagney
and Lacey (1982 — 1988) as Christine Cagney's (Sharon Gless) erstwhile boyfriend Sergeant Dory
McKenna, whose drug problem compromises his value as a police
officer.

After working as director Mark Rydell's
assistant on The Rose
(1979), Primus has increased his behind-the-camera activities; in
1992, he directed his first theatrical feature, the "inside"
Hollywood comedy/drama Mistress.

Barry
Primus taught acting and directing classes at the American Film Institute, The Lee
Strasberg Theatre Institute, the UCLA campus, and
at The Workshop in Maine. He
created and moderates the video podcast Inner Object
which interviews actors about their craft.